Power Converter Timing Control with Integrated On-Off Time Generation
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Solution Overview
Problem
Ramp-based power converters face challenges in maintaining accurate voltage output and stability under varying loads and operating conditions, requiring improved control strategies to ensure seamless transitions and efficient load adjustments.
Innovation Solution
A power converter design incorporating a power stage, feedback circuit, ramp generator, and controller with a comparator, control logic circuit, on-time and off-time generators, and a combined time generator to generate pulse width modulation signals, enabling separate control of duty cycle and off-time periods, facilitating seamless transitions and reduced circuit size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate on-time generator and off-time generator are used, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the on-time generator and off-time generator into a single integrated controller circuit that can independently control both on-time and off-time parameters. This merging approach maintains the control precision of separate generators while reducing device complexity by sharing common components such as the comparator, ramp generator, and control logic circuitry.
2Device complexity
If circuit components are reduced, then device complexity is reduced, but manufacturing precision may worsen
Solution Approach 1:
The integrated controller circuit is designed to perform multiple functions including on-time generation, off-time generation, comparison, and pulse width modulation control within a single unified structure. This multi-functionality reduces the total number of discrete components needed while maintaining manufacturing precision through standardized design and fabrication processes.
Data Source
AI summary
A power converter includes a power stage, a feedback circuit, a ramp generator and a controller. The power stage generates a pulse width modulation signal for forming an output voltage. The controller includes a comparator, a control logic circuit, an on-time generator and an off-time generator. The comparator generates a comparison signal according to a compensation signal from the feedback circuit and a ramp signal from the ramp generator. The control logic circuit generates a first trigger signal according to the comparison signal and an off-time pulse signal. The on-time generator generates a duty signal according to the first trigger signal. The duty signal is transmitted to the power stage for controlling a duty cycle ratio of the pulse width modulation signal. The off-time generator generates the off-time pulse signal according to the duty signal and transmits the off-time pulse signal to the control logic circuit.